Dynamo-electric machine



Feb.' 21, 1933. H, L; SMITH DYNAMO ELECTRIC MACHINE Filed March 28, 1931 j Patented Feb. 21, 1933 Y UNITED STATES PATENT OFFICE HAROLD L. SMITH, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO THE LOUIS ALLIS COM- '.PANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN DYNAMO-ELECTRIG MACHINE Application filed March 28; 1931. Serial No. 526,054.

The invention relates to dynamo electric machines.

The dynamo electric machine in which the present invention is employed is a modification of the invention described and claimed in cio-pending application Serial No. 361,767 filed by the same applicant May 97 1929 and issuing into Patent No. 1,799,071 upon March 31, 1931. j

The invention has as its object to provide a dynamo electric machine which is simple and compact and which may be readily manufactured.

Another object is to provide a simple and eicient stator to which a removable end plate may be readily fastened upon each end thereof.

Another object is to facilitate providing the stator with a closed inner casing and an open outer casing.

According to the present invention, the stator is provided with an end ring arranged upon each end of its core and having an axial or lateral flange to form in part an outer casing to provide Ca passage for external air over the core, and a removable end plate is fastened to each end ring.

The dynamo electric machine which is hereinafter described and shown in the accompanying drawing is an induction motor in which the invention is embodied.

The views in thev drawing are as follows Fig. 1 is `a front sectional view4 of the motor. l

Fig. 2 is an end view thereof.

The-motor is provided'with a stator having a laminated core 1 carrying a primary winding and a rotor having a laminated core 2 arranged within the stator core and carrying a secondary winding.

The stator has arranged upon each end thereof a removable closed end plate 3 to The rotor core is arranged within the stator' core upon a rotor shaft 6 carried by ball bearings 7, one of which is arranged in each end plate. A

The ball bearing is arranged within a socket 8 formedV in the end plate and it is held therein by a removable cap 9 fastened to the end plate by bolts 10.

The end plate has a continuous inward flange 11 in engagement with the end of the stator core andan outward flange 12 which extends beyond the outside of the core and carries a peripheral flange 13.

The inward flange 11 forms with the stator core an elongated joint having sufficient length to quench ignited or exploded gas from within the inner casing before it reaches the outside thereof. i

The two flanges 12 form an outer casing surrounding the stator core for the passage of external air thereover, and the. core dissipates its heat by direct metallic conduction to the air passing through the outer casing.

The bolts 5, which fasten the end rings together, pass through the flanges 12 intermediate openings 14 which are formed therein for the passage of air into and out of the outer casing.

The end plate is fastened to the end of its adjoining end ring by bolts 15, and it forms with'the end plate an elongated joint having suiicient length to quench ignited or eX- ploded gas from within the inner casing before it reaches the outside thereof.

The end plate has formed thereon apart from the AJearing for the shaft a central sleeve 16 extending over and around the shaft to form an elongated joint between the end plate and the shaft.

The elongated joint thus formed between the end plate and the shaft has sufficient length to quench ignited or exploded gas from within the inner casing before it reaches the outside thereof.

One of the outward flanges 12 carries an end casing 17 which communicates with the openings 14 formed therein and is secured in position by bolts 18.

The end casing is provided with a central l high l uitmaken.

The Q= casing through the outer casing stator is? rtedin any'feuitable manner as by Legs l2.1 carriedL bytthe outer mme i.

motor which has been has l5. high capacity and eciency for argiven size me .and given. .ever-al1 dimensions, even f' lwghrtfi enclosedswithin a closed inner u A its .corel di'lcipatee i. itsy heat-yat a rate by direct` inetallic oadudilon to Th invention set forth is suscepti- 'hhoiiyarions ions within the scope of the appended claims.4

Ainventiini wh' h has been shown and I dtbda is hereby aimed as -follows:

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fndhtmg ita-shaft endzpategan apettuzedioimward; Bange in einsehen@ when einge arranged upon the outer ed e of each out ward flange and forming wit each other In. outer casing to provide a passage for external air over said core, and means to cause ex i ternal air to flow through said outer casing. W 4. A dynamo electric machine, ixgiiiprising hv a stator provided with a lmninataicore having its outside exposed to external air and an end rin arranged upon each end thereof f to bind its aminat1onst0gether,a closede'nii *75Y a plate arranged uponr each end ring and n i forming therewith and with said core a closed 'inner casing, a rotor arran ed within ,saidstvatlor and having its shaft aring in 'i y said-end lates, fianges carried by saidend n' rings. a forming an: outer casing. to, f vide a passage for external air over Said core, an end casing arranged upon eine and l of said outer casiand spaced` froinlsid inner casing, and a arranged in Said emi casing and carried by said shaft to causaal-i M ternal air to flow through said end casing' and through sai-douter in tact with said core. 5. A dynamo electric machine, compri a stator provided with a laminated cone har?. ing its outside exposed to external air and p an end ring arranged upon each end .tlllmmgel to bind its aminationstogethena cln'eedmd late arranged upon each emi:I :iig ,and Q oi'iiung4 therewith with Said comme, 11;. I closed inner casing, a rotor arran .f s said; stator and having its shaft, g in f A and d f d D said. outer:vd space, rom sai inneemt!! Si s arranged in said end i., said shaft to cause external. au' through said end easing and through outer casing in direct contaetwithc said l 6. A dynamo electric machine, stator provided with om 5f ing its outsideexposed to extemnllarf i im. end` I ln arranged upon each. and; t to bind its aminations together, a closed 'u i plate arrangedjupon each end ringy and ing therewith and with said core a closnas. ner casinghaving between mchendj its xiidliloimng end plate anelougntad )bint of Y cient length tmquenchignitqdslor elf? u plpded gas the. interior of casing before it reaches the outiiidei a'rotor arran d within Said stator and ing its shaft atingv insaid endr plates; eloimated. sleeige 11" upon. endl, .d plateparoundsaid shaft and saidshaft and said endephitem--y y! formed integral with Bauhof;

toV rovide a passage for external air over sai core, and means to cause external air to Vflow through said outer casing.

, 7. A dynamo electric machine, comprising a. stator provided with a laminated core having its outside exposed to external air and an end ring arranged upon each end thereof to bind its laminations together, a closed end plate arranged upon each end ring and forming therewith and with said core a closed inner casing having between each end ring and its adjoining end plate an elongated joint of suiicient length to quench ignited or exploded gas from the interior of said inner casing before it reaches the outside thereof, a rotor arranged within said stator and having its shaft bearing in said end plates, an `elongated sleeve arranged upon each end plate around said shaft and forming between said shaft and said end late an elongated joint having sufficient ength to quench ignited or exploded gas from within said inner casing before it reaches the outside thereof, an apertured outward flange carried by each end ring, a peripheral flange arranged upon the outer edge of each outward fiange and forming with each other an outer casing to provide a passage for external air over said core, and means to cause external air to flow through said outer casing.

8. A dynamo electric machine, comprising a stator provided with a laminated core having its outside exposed to external air and an end ring arranged upon each end thereof to bind its laminations together, a closed end plate arranged upon each end ring and forming therewith and with said core a closed inner casing having between each end ring and its adjoining end plate an elongated joint of sufficient length to quench ignited or exploded gas from the interior of said inner casing before it reaches the outside thereof, a rotor arranged within said stator and having its shaft bearing in said end plates, an elongated sleeve arranged upon each end plate around said shaft and forniing between said shaft and said end plate an elongated joint having sufficient length to quench ignited or exploded gas from within said inner casing before it reaches the outside thereof, flanges carried by said end rings and forming an outer casing to provide a passage for external air over said core, an end casing arranged upon one end of said outer casing and spaced from said inner casing, and a fan arranged in said end casing and carried by said shaft to cause external air to flow through said end casing and through said outer casing in direct contact with said core.

9. A dynamo electric machine, comprising a stator provided with a laminated core having its outside exposed to external air and an end ring arranged upon each end thereof to bind its laminations together, a closed end plate arranged upon each end ring and forming therewith and with said core a closed inner casing having between each end ring and said core and between each end ring and its adjoining end plate an elongated joint of sufficient length to quench ignited or exploded gas from the interior of said inner casing before it reaches the outside thereof, a rotor arranged within said stator and having its shaft bearing in said end plates, an elongated sleeve arranged upon each end plate around said shaft and formingbetween said shaft and said end plate an elongated joint having sufficient length to quench ignitedor exploded gas from within said inner casing before it reaches the outsidethereof, an apertured outward flange carried by each end ring, a peripheral fiange arranged upon the outer edge of each outward flange and forming with each other an outer casing to provide a vpassage for external air over said core, and means to cause external air to flow through said outer casing.

lO. vA dynamo electric machine, comprising a stator provided with a laminated core having its outside exposed to external air and an end ring arranged upon each end thereof to bind its laminations together, a closed end plate arranged upon each end ring and forming therewith and with said core a closed inner casing having between each end ring and said core and between each end ring and its adjoining end plate an elongated joint of sufficient length to quench ignited or exploded gas from the interior of said inner casing before it reaches the outside thereof, a rotor arranged within said stator and having its shaft bearing in said end plates, an elongated sleeve arranged upon each end plate around said shaft and forming between said shaft and said end plate an elongated joint having sufficient length to quench ignited or exploded gas from within said inner casing before it reaches the outside thereof, flanges carried by said end rings and forming an outer casing to provide a passage for external air over said core, an end casing arranged upon one end of said outer casing and spaced from said inner casing, and a fan arranged in said end casing and carried by said shaft to force external air through said end casing and through said outer casing in direct contact with said core.

11. A dynamo electric machine, comprising a stator provided with a laminated core, an end ring arranged upon each end of said core and connected to each other to clamp said core therebetween, an end plate arranged upon each end of said stator and forming therewith a closed inner casing having suiicient strength to resist a gaseous explosion within its interior, a rotor arranged within said stator and having a shaft l' n' im *if #in mi mi by open' onwnmg with enh and ring iextemingfunr'nd around said eure t n, tmmivtknbdml a ventilmmg-p ionuhernni nn end@ u.

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